| Current (3) |
| Chairman | 2021 |
| Board of Directors | 2023 |
| Board of Directors | 2017 |
| Former (23) |
| Board of Directors | 1966 – 1994 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 1966 – 1992 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 2015 – 2017 |
| Board of Directors | 2010 – 2014 |
| Board of Directors | 2016 – 2023 |
| Chairman | 2016 – 2021 |
| Board of Directors | 1966 – 1994 |
| Chairman | 2002 – 2004 |
| Board of Directors | 1966 – 2000 |
| Chairman | 2004 – 2016 |
| Board of Directors | 2001 – 2004 |
| Chairman | 1966 – 1994 |
| Board of Directors | 2004 – 2006 |
| Board of Directors | 1995 – 1999 |
| Board of Directors | 2009 – 2010 |
| Chairman | 1999 – 2002 |
| Chairman | 1966 – 1995 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 1966 – 1994 |
| Board of Directors | 1999 – 2004 |
| Board of Directors | 1966 – 1992 |